Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
B3950 02
Will set if there is a short to ground in the left rear turn signal circuit
B3950 05
Will set if there is an open or short to voltage in the left rear turn signal circuit